# Agent Log — codex-nplusone-pos1-20260220T012300Z-c5he

- alias: `codex-nplusone-pos1`
- mission: `Fix N+1 false-negative when known sentence fails due to Yomitan functional token counting`
- status: `completed`
- started_utc: `2026-02-20T01:23:00Z`
- heartbeat_minutes: `5`

## Intent

- reproduce user-reported case: known `私/あの/欲しい`, unknown `仮面`, no N+1 color
- add failing regression test first
- patch N+1 candidate filter to ignore functional `pos1` from MeCab enrichment for Yomitan tokens
- run focused tests

## Planned Files

- `src/core/services/tokenizer.test.ts`
- `src/token-merger.ts`

## Assumptions

- issue path: Yomitan tokens have `partOfSpeech=other`; candidate exclusion relies mostly on `partOfSpeech`
- MeCab enrichment supplies `pos1`; N+1 filter currently underuses it

## Progress

- 2026-02-20T01:23:00Z: started; context loaded; preparing RED test
- 2026-02-20T01:28:02Z: RED confirmed; new regression test fails (`targets.length` expected 1, got 0)
- 2026-02-20T01:28:14Z: GREEN confirmed; patched N+1 candidate filter to ignore functional `pos1` (`助詞`,`助動詞`,`記号`,`補助記号`); tokenizer test file all pass

## Files Touched

- `src/core/services/tokenizer.test.ts`
- `src/token-merger.ts`
- `docs/subagents/INDEX.md`
- `docs/subagents/agents/codex-nplusone-pos1-20260220T012300Z-c5he.md`

## Handoff

- regression covered for user-reported case pattern (`私も あの仮面が欲しいです` with known `私/あの/欲しい`)
- no blockers